html {
	height: 100%;
}

body {
	margin: 0;
	height: 100%;
}

h1,h2,ul {
	margin: 0;
}

header {
	background-color: black;
	color: white;
}

nav {
	background-color: yellow;
	overflow: auto;
	padding-bottom: 50px;
}

section {
	background-color: blue;
}

footer {
	background-color: black;
	color: white;
	height: 50px;
	position: relative;
	margin-top: -50px;
	height: 50px;
	clear: both;
}